Hm, I put mine together without too much bother, 2 or 4 hours on each, done on the first attempt. Hindsight: 3 mm upper strips are too weak the but 5 mm or so should do fine. Also, place them an inch or so above the tyre. I went for ~15 mm and now I cannot mount a tyre slightly larger than the one I measured with. Update: the upper one does all the flapping, but the bottom (rear) one breaks at the weld from torsional loads.
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